// AuthenticatedUser.cs
//
//  Copyright (C) 2008 Amr Hassan
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
//

using System;
using System.Collections.Generic;
using System.Xml;

namespace Lastfm.Services
{
	/// <summary>
	/// The authenticated user.
	/// </summary>
	/// <remarks>
	/// To create an an object of this class, you'd have to call
	/// <see cref="AuthenticatedUser.GetUser"/>.
	/// </remarks>
	public class AuthenticatedUser : User, IHasImage
	{
		private AuthenticatedUser(string username, Session session)
			:base(username, session)
		{
		}
		
		/// <summary>
		/// Returns the authenticated user of this session.
		/// </summary>
		/// <param name="session">
		/// A <see cref="Session"/>
		/// </param>
		/// <returns>
		/// A <see cref="AuthenticatedUser"/>
		/// </returns>
		public static AuthenticatedUser GetUser(Session session)
		{
			//check for authentication manually
			if(!session.Authenticated)
				throw new AuthenticationRequiredException();
			
			XmlDocument doc = (new Request("user.getInfo", session, new RequestParameters())).execute();
			
			string name = doc.GetElementsByTagName("name")[0].InnerText;
			
			return new AuthenticatedUser(name, session);
		}
		
		/// <summary>
		/// Returns the url to the authenticated user's avatar.
		/// </summary>
		/// <returns>
		/// A <see cref="System.String"/>
		/// </returns>
		public string GetImageURL()
		{
			XmlDocument doc = request("user.getInfo");
			
			return extract(doc, "image");
		}
	}
}
